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Open Tacacs on the Perimeter
From: "Josh Perrymon" <perrymonj () networkarmor com>
Date: Wed, 28 Sep 2005 15:21:44 -0500

From: Josh Perrymon 
Sent: Wednesday, September 28, 2005 4:20 PM
To: pen-test () securityfocus com
Subject: Open Tacacs on the Perimeter

I'm doing a VA and I found port 49 ( TACACS ) open on the perimeter router. All other ports are closed.

My would someone open TACACS to the internet? I'm guessing this is a config error because all the authenticating 
devices would be on the inside of the network due to this being the perimeter device.

If this was a PT what vectors would you have to exploit this open port? Looks like it is closed upon telnetting to 
anyway- however this could be due to the port looking for a certain response from a client????

Joshua Perrymon
Sr. Security Consultant
Network Armor
A Division of Integrated Computer Solutions
perrymonj AT networkarmor.com

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